Treatment of artificial filaments



. than the at or parts of t e yarn bo Patented July 19, 1932 UNITEDSTATES PATENT OFFICE JACK L. 21mm, 0] ELIZABETH'ION, AND RICHARDELSSNER, OF JOHNSON CITY, TENNESSEE, ABBIGNORG 'I'O AMERICAN GLANZSTOFFCORPORATION, OF NEW YORK.

N. Y, A CORPORATION OF DELAWARE TREATMENT OF ARTIFICIAL FILAMENTS HoDrawint.

Our invention relates to an improved process for the production ofartificial threads, and more particularly to an improved process forroducing thread having even elongation and strength.

In the production of artificial silk, accord- .ing to the wet spinningprocess, a cellulosic solution is spun into a suitable coagulatingmedium and the freshly spun threads are collected on suitable spools.The filled spools are then subjected to several after-treatments, suchas washing, dezulphurizing, bleaching and drying. It is to beunderstood, however, that the desulphurizing and bleaching steps may beomitted and our invention is not to be limited to the specific aftertreatments mentioned since these steps are given merely by way of examle.

During the drying process the washed tyarn shrinks, and the outer layersof the yarn ody will shrink more than t ose layers adj aoent the spool,since the latter shrink against a comparatively unyielding surface. Thisresults in an uneven and poor quality of thread since that portionof thethread will possess a lower elon ation and hi her strength quality y.These difi'erences of the physical properties are highly undesirable inthe dyeing of woven and knitted goods resulting in the so called shineror barre eifects on the goods.

According to our invention the thread treated in the manner noted above,is twisted on any desirable type of spool, and after more or lessspraying, is then subjected to a second drying resultin in the yarnwhich was adj acent t e spool uring the first drying will be on theoutside of the yarn body during the second dryin Thus the yarn lastmentioned have t e same opportunity to shrink as did the outer layers ofyarn before the twisting operation.

The manner in which our invention ma be carried into'efiect can be wellillustrate by the following examples, it being understood that these aregiven only by way of illustration and can be varied widel withoutdeparting from the. scope thereo Example 1.About 70 ams viscose yarn,150 denier with 32 filaments, soft lustre, spun Application fled August29, 1931. Serial 110. 560,226.

on a perforated, lacquered spool, with a circumference of 230 mm. andlength of 130 mm. is washed by drip-washing or vacuum washing and isimmediately desulphurized and bleached after which it is dried at atemperature of about 7 0 C. After conditioning the yarn is twisted onany kind of twisting machine in a room which is kept at about 80%humidity. After that time the spool is sprayed and then is placed in adryer for about from 2-8 hours, at about G. Then the yarn is conditionedonce more and wound on cones.

Ewam Ze 2.About 250 grams viscose yarn, 200 denier, with 40 filaments,high lustre, spun on a corrugated rubber spool with a circumference of400 mm. and a length of 200 mm. is washed by drip-washing or vacuumwashing and is immediately desulphurized and bleached, and is then driedat a temperature of about 70 C. After conditioning the spool is twistedon a top twisting machine in a room where the moisture content is about60-80%. After that time the spool is sprayed and brought once more to adryer for about 2-8 hours, at about 70 G. Then the spool is conditionedonce more and the yarn wound upon cones.

Having now fully set forth our invention as required by the patentstatutes, what we desire to claim is 1. In a method of treating spooledartificial filaments, and the like the ste s of wet-treating, drying,rewetting and re rying, the filaments and the like being rewound ontoanother holder between the first and second dryinlg.

2. n a method for treating freshly spun spooled artificial filaments thesteps of successively drying, twisting, spraying and drying the same.

3. In a method for treating freshly-extruded viscose filaments, thesteps of winding on spools, washing and desiflphurizing the same,drying, twisting, rewetting and redry- 4. In a method for producing ayarn with an even contraction and strength, the steps of spoolingwet-treating and drying the yarn, rewmding so that the yarn formerly onthe outer side of the holder is on the inside, then rewetting andredryin the yarn.

5. In a process for t e production of yarn with even shrinkage, thesteps of extruding the yarn, winding it onto spools, wet treating it,rewinding onto other spools so the yarn formerly on the inner side ofthe spool ody is later on the outer side, rewetting and redrying.

6. In a process of the class set forth, the steps of windingfreshly-spun artificial yarn upon a spool or the like, desulphurizing,bleaching and otherwise aftertreating it, drying at a temperature ofapproximately 70 C., twisting onto another spool or the like, rewetting,and redrying over a period of from two 16) eight hours at a temperatureof about 7. In a process of the class set forth, the steps of windingfreshly-spun artificial yarn upon a spool or the like, desulphurizing,bleaching and otherwise aftertreating it, dry ing at a temperature ofapproximately 70 C., conditioning, twisting onto another spool or thelike, rewetting, and redrying over a period of from two to eight hoursat a temperature of about 70 C.

8. In a process of the class set forth, the steps of windingfreshly-spun artificial yarn upon a spool or the like, desulphurizing,bleaching and otherwise aftertreating it, drying at a temperature ofapproximately 70 (1. conditioning, twisting onto another spool or thelike, in a room the humidity of which is from to 80%, rewetting, andredrying over a period of from two to eight hours at a temperature ofabout C.

9. In a process of the class set forth the steps of winding afreshly-spun artificial yarn upon a spool or the like, drying at arelatively high temperature, twisting onto another spool or the like,rewetting, and redrying at-a relatively high temperature.

In testimony whereof we aflix our signatures.

JACK L. BITTER. DR. RICHARD ELSSNER.

DISCLAIMER I,867,610.Jac'lc L. Bitter, Elizabethton, and' RichardElssner Johnson City, Tenn.

TnEA'rMEN'r or ARTIFICIAL FILAMENTS. Dlsclaimer filed November 10, 1934,by the assignee, North American Rayon Corporation.

Hereby disclaims from the scope of claims 1, 4, and 5 of any method orprocess other than those in which the artificial filaments or yarn aredried at about 70 C. on each holder or spool and/or in which theartificial filaments or yarn are desulphurized and subsequently twistedand rewound onto the second holder or spool.

[Ofimlal Gazette December 4, 1934.1

Patent ated July 19, 1932.

said Letters Patent outer side of the holder is on the inside, thenrewetting and redryin the yarn.

5. In a process for t e production of yarn with even shrinkage, thesteps of extruding the yarn, winding it onto spools, wet treating it,rewinding onto other spools so the yarn formerly on the inner side ofthe spool ody is later on the outer side, rewetting and redrying.

6. In a process of the class set forth, the steps of windingfreshly-spun artificial yarn upon a spool or the like, desulphurizing,bleaching and otherwise aftertreating it, drying at a temperature ofapproximately 70 II C., twisting onto another spool or the like,

rewetting, and redrying over a period of from trwo t6) eight hours at atemperature of about 7. In a process of the class set forth, the stepsof winding freshly-spun artificial yarn upon a spool or the like,desulphurizing, bleaching and otherwise aftertreating it, dry ing at atemperature of approximately 70 C., conditioning, twisting onto anotherspool or the like, rewetting, and redrying over a period of from two toeight hours at a temperature of about 70 C.

8. In a process of the class set forth, the steps of windingfreshly-spun artificial yarn upon a spool or the like, desulphurizing,bleaching and otherwise aftertreating it, drying at a temperature ofapproximately 70 (1. conditioning, twisting onto another spool or thelike, in a room the humidity of which is from to 80%, rewetting, andredrying over a period of from two to eight hours at a temperature ofabout C.

9. In a process of the class set forth the steps of winding afreshly-spun artificial yarn upon a spool or the like, drying at arelatively high temperature, twisting onto another spool or the like,rewetting, and redrying at-a relatively high temperature.

In testimony whereof we aflix our signatures.

JACK L. BITTER. DR. RICHARD ELSSNER.

DISCLAIMER I,867,610.Jac'lc L. Bitter, Elizabethton, and' RichardElssner Johnson City, Tenn.

TnEA'rMEN'r or ARTIFICIAL FILAMENTS. Dlsclaimer filed November 10, 1934,by the assignee, North American Rayon Corporation.

Hereby disclaims from the scope of claims 1, 4, and 5 of any method orprocess other than those in which the artificial filaments or yarn aredried at about 70 C. on each holder or spool and/or in which theartificial filaments or yarn are desulphurized and subsequently twistedand rewound onto the second holder or spool.

[Ofimlal Gazette December 4, 1934.1

Patent ated July 19, 1932.

said Letters Patent

